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Siri now makes suggestions for people to contact – based on the time of day and your location.

Users will be able to watch videos from YouTube within the Spotlight search.

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Siri will suggest apps and contacts based on your location and habits

The software's search feature has also been improved, now enabling users to see and jump straight into apps from search results.

Siri can also now be used to voice search for photos on you device.

Apple has also added some clever machine learning to its photos app, which means you can ask Siri to find photos "of me in San Francisco last year".

The firm is calling the whole update "Intelligence".

Mr Federighi also made a point on privacy by saying that Apple is "not interested" in user data and that Apple doesn't mine user data.

"It stays on your device, under your control," he said.

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Public transport information will also roll-out with the latest update to the iPhone and iPad

iOS 9 will also provide those who upgrade with a battery life boost of up to an hour.

The Cupertino company has put a number of clever software tweaks in place to find the extra hour of battery, including iPhones will now uses proximity and ambient light sensors to determine whether the smartphone is facedown on a table.

If it thinks the phone is lying on its front, iOS 9 will not turn on the display – even when a new Notification is received.

Battery information is now included as a widget in the Notification Centre, which will include the latest percentages from your iOS device and Apple Watch.

Apple will continue to battery shame third-party developers in its settings. iOS 9 includes a more detailed list of which apps are draining the most – and least – amount of power from your smartphone.

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Speaking at the WWDC keynote, Craig Federighi explained how iPhone users often desperately toggle options and settings to try and eek out a few more hours when their battery percentage dips to single digits.

The latest mobile update adds a battery saver mode which "pulls switches you didn't even know existed" to give iPhone and iPad users an extra three hours of battery – on-top of the additional hour.

With Low Power Mode turned on – background activity, motion effects, and animated wallpapers are all disabled.

Brightness and networking speed are dimmed and reduced. Background downloads are suspended and Mail is only fetched manually.